It gets tiring doesn't it? lol Especially when you have multiple dx's and physical problems. I just recently realized that my back and hip pain almost abruptly stopped as soon as the source of stress for me was gone. I was like "wow, really!?". Very frustrating.
I know it's gonna sound crazy (everything i say does lol) but when i am feeling very down I watch "Castaway" with Tom Hanks. I don't know if you've ever seen it but for some reason when i watch it, any feelings of pity or depression go away at least for a while.
I think it's a cursed life we live when we have to deal with these monumental mood swings all the time. No one else can really fully understand it. Just the emotional exhaustion from trying to keep it all in check is enough to wipe me out some days. Then people ask "what did you do today" and all i can think is..."you wouldn't get it" lol.
I know my thoughts are a jumbled mess but I hope this helps.